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x in (-oo:+oo)
x/2-(3*x) = -35 // + 35
x/2-(3*x)+35 = 0
x/2-3*x+35 = 0
35-5/2*x = 0 // - 35
-5/2*x = -35 // : -5/2
x = -35/(-5/2)
x = 14
x = 14
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